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Firearms Identification: Matching Bullets

Firearms Identification: Matching Bullets

Examine how bullets fired from different guns have unique markings. Natural laws in cause-and-effect relationships and machine defects aid in forensic identification. Learn how to analyze similarities to determine the likelihood of a match, like finding the missing puzzle piece.

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Quiz30 Questions
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Firearms Identification: Matching Bullets

Quiz • 30 Questions

Firearms Identification: Matching Bullets - Flashcards

Flashcards • 30 Cards

Study Notes

18 min • Summary

Materials

List of Questions30 questions
  1. Question 1
    • Parts in many firearms are interchangeable, so the same serial number wouldn't necessarily appear on all parts that contact the ammunition.
  2. Question 2
    • It can largely remove the evidence of groove engravings.
  3. Question 3
    • To determine the presence of grooves and other characteristics to know caliber and hints the cartridge size.
  4. Question 4
    • It is more valuable than just rifling specifications, especially for firearms that may not have available rifling data.
  5. Question 5
    • To narrow down the possibilities and identify the type and make of firearm that fired the cartridge.
  6. Question 6
    • It is an important indicator of class characteristics, particularly in rim-fire and center-fire cartridges, aiding in firearm identification.
  7. Question 7
    • Automatic firearms generally leave more marks and deformations, offering more opportunities to determine the class characteristics of the firearm.
  8. Question 8
    • Their design and how they interact with the cartridge case.
  9. Question 9
    • Because the condition of the firearm can change the ballistic fingerprint.
  10. Question 10
    • It is the deposit of bullet particles in the firearm's bore, which may alter the marks left on subsequently fired bullets.
  11. Question 11
    • Differences in pressure, hardness of the bullet, and the angle between the bullet and forcing cone all change the bullet's markins.
  12. Question 12
    • A firearm's design and random, small details combine a signature that also may change a little from different guns and ammo.
  13. Question 13
    • Those that are respectively made by the same land or groove.
  14. Question 14
    • They result from accidental characteristics and show matching adjacent elements that show bullets in phase.
  15. Question 15
    • Congruence describes when marks line up perfectly, while incongruence means the marks don't line up.
  16. Question 16
    • A bullet used in evidence in a case, and nicknamed those terms in murder cases.
  17. Question 17
    • Hard to figure out much about it, unless enough markings are present.
  18. Question 18
    • Because it's a unique standout feature that helps solve the case.
  19. Question 19
    • No test bullets should ever be thrown away in an investigation because every piece of info is important.
  20. Question 20
    • It can alter a bullet's signature due to wear and the transfer of the coating.
  21. Question 21
    • Helps pinpoint the location of certain marks.
  22. Question 22
    • This difference means that the casing doesn't match the gun.
  23. Question 23
    • A witness's opinion isn't allowed if the facts of the case are clear enough for the jury.
  24. Question 24
    • The recognition of natural laws whose cause and effect relationships have been long recognized by the courts.
  25. Question 25
    • A machine inevitably develops through wear and accident certain defects, such as scars or bruises. These accidental characteristics give each machine its own uniqueness in identification.
  26. Question 26
    • Group I small arms have smooth-bore barrels, while Group II have rifled barrels.
  27. Question 27
    • Black and brown powder contain inorganic substances and that leaves residue, whereas smokeless powders mainly contain organic compounds and less residue.
  28. Question 28
    • Used to ignite powder charge in muzzle-loading firearms. Usually a composition containg Mercury.
  29. Question 29
    • To impart projectile a motion of rotation. Can be unifrom or increasing twist.
  30. Question 30
    • Class can be determined before whereas accidental can only be determined after. Accidental happen by chance, wear or damage.
List of Flashcards30 flashcards
  1. Card 1
    HintLike a fingerprint for guns.Memory TipEvery gun has a unique signature.
  2. Card 2
    HintMarks from the barrel's raised parts.Memory TipLands leave marks, like footprints.
  3. Card 3
    HintMarks matching the barrel grooves.Memory TipGrooves create engravings on bullet.
  4. Card 4
    HintLike synchronized movements.Memory TipIn phase = aligned and matching
  5. Card 5
    HintFingerprints of firearms.Memory TipIdentity marks = unique details.
  6. Card 6
    HintAdjacent marks align.Memory TipCongruent elements build confidence.
  7. Card 7
    HintMarks do not fit.Memory TipIncongruence = incompatible signatures
  8. Card 8
    HintBullet with the vital clues.Memory TipEvidence bullet links to the criminal.
  9. Card 9
    HintStandout feature for easy solving.Memory TipConspicuous = easy to spot
  10. Card 10
    HintOld gunpowder's calling card.Memory TipBlack powder = dirty base.
  11. Card 11
    HintRelated to the weight.Memory TipGage = weight ball diameter.
  12. Card 12
    HintThe propellent force.Memory TipPowder charge = propulsion power
  13. Card 13
    HintOldest firearm propellant.Memory TipBlack powder is old.
  14. Card 14
    HintSolving the puzzle.Memory TipIdentification relies on ammo clues.
  15. Card 15
    HintA propelling instrumen.Memory TipFirearm = projectile propulsion
  16. Card 16
    HintThe barrel's path.Memory TipBore = barrel's pathway.
  17. Card 17
    HintThe exit point.Memory TipMuzzle = projectile's exit.
  18. Card 18
    HintKeeps gases contained.Memory TipBreechblock prevents gas.
  19. Card 19
    HintOrdnance, concealable.Memory TipSmall arms = concealable and less than 1 inch
  20. Card 20
    HintThey propel the bullet or projectile.Memory Tipexpolsion to propel
  21. Card 21
    Hintvolatile with solvent stabilizerMemory TipNitrocellulose powder needs solvent.
  22. Card 22
    Hinthelical spiral grooves cutMemory Tiprifled barrel = spiral grooves
  23. Card 23
    HintDiameter for a firearm.Memory TipCaliber the bore diameter.
  24. Card 24
    HintMetallic cups used to ignite muzzle loading firarm.Memory Tipcharge ignition
  25. Card 25
    HintDirect blow causing explosionMemory TipRim = cavity in rim
  26. Card 26
    HintPrimer exploded by force.Memory TipCenter= middle of cartridge
  27. Card 27
    HintBullet cased in metal.Memory TipAmmunition,metallic case.
  28. Card 28
    HintSecuring cartridge case.Memory TipA groove,secured
  29. Card 29
    HintFirearm removalMemory Tipremoving cartridge
  30. Card 30
    HintThrow actionMemory TipEject=force

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